SECOND ROUND LEADERBOARD: GB & Ire unless stated
-7 G Havret (Fra) -6 R Rock -5 B Dredge, P Whiteford -4 M Campbell (NZ), S Hansen (Den), D Howell, G Orr
Selected others: -2 C Montgomerie, J Rose, L Westwood -1 D Clarke, N Dougherty, P McGinley Level R Fisher +2 O Wilson Missed cut: +3 M Kaymer (Ger) +5 G McDowell
Rose is hoping to cement his Ryder Cup place at Gleneagles
Gregory Havret maintained his lead of the Johnnie Walker Championship as Justin Rose and Soren Hansen kept up their push to cement Ryder Cup berths.
France's Havret shot 71 for seven under, one clear of Robert Rock.
Rose (8th in the Cup table) was two under, Hansen (9th) was four under, and Oliver Wilson (10th) scraped into the weekend to also all-but seal his spot.
Colin Montgomerie and Darren Clarke, who are chasing Ryder Cup wildcards, ended two under and one under.
Rose, 28, who would make his Ryder Cup debut in Kentucky, said: "Mentally I'm strong, I'm enjoying my golf and enjoying the challenge and right now it looks good for me.
"But I'm sure the guys (behind) will keep the pressure on so there's no relaxing."
It was the biggest round of golf in my career
Neither Montgomerie, who carded a three-under 70 on Friday, nor Clarke (73) can qualify in the top 10 automatic European Ryder Cup spots at the end of the tournament and are hoping to receive one of two wildcards from captain Nick Faldo on Sunday.
"I have to show form to have any chance. If I win I have a sporting chance but I don't necessarily have to win," said eight-time Ryder Cup veteran Montgomerie.
England's Wilson was six over par with 10 holes to play but fired an eagle and two birdies to end two over and survive the halfway cut by the skin of his teeth.
"It was the biggest round of golf in my career," said Wilson, who is also chasing a Ryder Cup debut. "I knew if I missed the cut, it was pretty much over. I've given myself a chance."
Before the tournament, Rose, Hansen and Wilson could only be overtaken by Nick Dougherty, Martin Kaymer or Ross Fisher.
England's Dougherty, who must finish in the top two to displace Wilson, reached halfway at one under after a 72.
Another Englishman Fisher, who needs a top three, was level par after a 74 but Germany's Kaymer finished three over and missed the cut to end his hopes.
Kaymer is unlikely to be considered for a wildcard, with the other contenders thought to be English pair Paul Casey and Ian Poulter, who are both playing in the Deutsche Bank Championship in the US, and Ireland's Paul McGinley, who shot a four-under 69 for one under in Scotland.
"Other guys deserve it more than me," said Kaymer, who had been in the top 10 for much of the season.
"Clarke, Casey, Montgomerie, McGinley, they all have far more experience. I'll just have to try again in two years' time."
Poulter, at 12th on the standings, could have tried to qualify by right at Gleneages but opted to play in America and hope for a wildcard.
England's Lee Westwood, already assured of his Ryder Cup berth, shot a second straight 72 for two under.
But Northern Ireland's Graeme McDowell, who is seventh in the table and also safe, missed the cut at five over.
The 37th Ryder Cup takes place at Valhalla Golf Club in Louisville, Kentucky, from 19-21 September.